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Optical and Infrared Nondetection of the z = 10 Galaxy behind Abell 1835
Smith, Graham P.; Egami, Eiichi; Eisenhardt, Peter R. +2 more
Gravitational lensing by massive galaxy clusters is a powerful tool for the discovery and study of high-redshift galaxies, including those at z>=6 likely responsible for cosmic reionization. Pelló et al. recently used this technique to discover a candidate gravitationally magnified galaxy at z=10 behind the massive cluster lens Abell 1835 (z=0.…
Multifractality in a ring of star formation: the case of Arp 220
de La Fuente Marcos, R.; de La Fuente Marcos, C.
Context: .Formation of super star-clusters can be triggered during the final stages of galaxy mergers or galactic interactions, when significant numbers of massive stars are formed out of large gas-cloud systems. Giant cloud complexes show a fractal structure due to turbulence and/or self-gravitation; therefore, super clusters formed out of these …
Theoretical Isochrones with Extinction in the K Band. II. J - K versus K
Lee, Myung Gyoon; Figer, Donald F.; Kim, Sungsoo S.
We calculate theoretical isochrones in a consistent way for five filter pairs near the J and K band atmospheric windows (J-K, J-K', J-Ks, F110W-F205W, and F110W-F222M) using the Padova stellar evolutionary models of Girardi et al. We present magnitude transformations between various K-band filters as a function of color. Isoc…
Productivity and Impact of Space-based Astronomical Facilities
Trimble, Virginia; Zaich, Paul; Bosler, Tammy
In 2001, 18 journals published about 1270 astronomical papers that reported and/or analyzed data gathered by space-based observatories and missions. These papers were cited 24,460 times in papers published in 2002-2004, an average of 19.26 citations per paper or 6.42 citations per paper per year (sometimes called impact or impact factor). About 60…
Kinematic control of the inertiality of the system of Tycho-2 and UCAC2 stellar proper motions
Bobylev, V. V.; Khovirtchev, M. Yu.
Based on the Ogorodnikov-Milne model, we analyze the proper motions of Tycho-2 and UCAC2 stars. We have established that the model component that describes the rotation of all stars under consideration around the Galactic y axis differs significantly from zero at various magnitudes. We interpret this rotation found using the most distant stars as …
HST BVI photometry of Triton and Proteus
Pascu, Dan; Rohde, James R.; Seidelmann, P. Kenneth +4 more
BVI photometry of Triton and Proteus was derived from HST images taken in 1997. The VEGAMAG photometric technique was used. Triton was found to be brighter by a few percent than observations of the 1970's and 1980's, as expected due to the increasingly greater exposure of the bright south polar region. The leading side was also found to be brighte…
Measurements of winds on Mars with Hubble Space Telescope images in 2003 opposition
Videen, G.; Kaydash, V. G.; Kreslavsky, M. A. +3 more
The winds of Mars at the water cloud level are measured by tracking cloud features in sequential high-resolution Hubble Space Telescope UV images for 5 days during the perihelion season in 2003. Global circulation model (GCM) predictions are in general agreement with the observations for the zonal wind component, but reveal significant differences…
Revealing the Mid-Infrared Emission Structure of IRAS 16594-4656 and IRAS 07027-7934
García-Lario, P.; Acosta-Pulido, J. A.; García-Hernández, D. A. +3 more
TIMMI2 diffraction-limited mid-infrared images of a multipolar proto-planetary nebula IRAS 16594-4656 and a young [WC] elliptical planetary nebula IRAS 07027-7934 are presented. Their dust shells are for the first time resolved (only marginally in the case of IRAS 07027-7934) by applying the Lucy-Richardson deconvolution algorithm to the data, tak…
Fe emission and ionized excess absorption in the luminous quasar 3C 109 with XMM-Newton
Fabian, A. C.; Miniutti, G.; Ross, R. R. +2 more
We report results from an XMM-Newton observation of the broad-line radio galaxy 3C 109 (z = 0.3056). Previous ASCA data revealed the presence of a broad iron line from the accretion disc with which the XMM-Newton spectrum is fully consistent. However, although improving the ASCA constraints on the line parameters, the quality of the data is not hi…
Injection and propagation of solar protons to high heliospheric latitudes: Ulysses Ket observations
Kunow, H.; Heber, B.; Müller-Mellin, R. +3 more
The Ulysses spacecraft at high heliographic latitudes has detected eight large solar energetic particle events during the recent solar maximum in 2000 and 2001 years. These events are easily identified with famous episodes of the solar activity and the corresponding SEP events near the Earth. Analyzing the absolute intensities of ∼40 100 MeV proto…